🚀 go-pugleaf

In article <1992May21.032639.7720@robohack.UUCP>, woods@robohack.UUCP (Greg A. Woods) writes:
> In article <9205201503.AA01446@moore.com> paul@moore.com (Paul Maclauchlan) writes:
> > Is there a utility that I can use to trim the contents of the wtmp
> > file from the "top"?
> 
> Ideally you'd want to chop it off at a given date, but this would
> require a bit of programming.

Trimming a number of records would be fine.

> However, if you want to simply chop off some number of records from
> the file, dd can do the job (example specific to SysVr3.1):
> 
> 	wtmprecsize=36		# this is the number 'sizeof(struct utmp)'
> 	nchop=1000		# how many records to chop off
> 	dd if=wtmp of=wtmp.tmp bs=$wtmprecsiz skip=$nchop
> 	cp wtmp.tmp wtmp	# must not use mv in case file is open

Excellent!  Does anyone know the Sun 4.1.1 value for "wtmprecsize"?
(Sorry for the dumb question....)

> I presume this is simply to satisfy users of last(1)....  If not, then
> why not just roll over the wtmp file every day/week/month?

I'd like to keep a minimum number of days/months data available.  Rolling
the file means that each time it is restarted, there is no history.

Thanks for your help, Greg.

-- 
.../Paul Maclauchlan
Moore Corporation Limited, Toronto, Ontario (416) 364-2600
paul@moore.com   -or-  {...!uunet.ca,...!telly}!moore!paul
"I thought it but I kept it hid"/EJ&BT'83